Abstract
A nanogranular thin film structure with concentration Co(c=0.8)Bi(1−c), and thickness about 100nm, exhibits one order of magnitude increase of the anomalous Hall coefficient RS (with an absolute value of |RS|=1.43μΩcm at 300K), relative to that observed in pure Co thin films. This may provide evidence that a Giant Hall Effect (GHE) contribution may appear well above the percolation threshold of Co, observed at c≈0.3 in Co(c)Bi(1−c) composite films. Electron microscopy (transmission and scanning), X-ray diffraction, transverse and perpendicular magnetoresistance, and Hall effect resistivity loops were employed to investigate the physical origin of this effect.
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